A small-size light controlling apparatus in which, it is not necessary to draw a wire for a diaphragm control, from a diaphragm mechanism, and an optical apparatus in which the light controlling apparatus is used, are provided. The light controlling apparatus includes a substrate having an optical aperture which is fixed, a diaphragm blade which is displaceable, a first magnet which is fixed to the diaphragm blade, and a coil which is disposed around the substrate. An external magnetic field which acts on the first magnet is changed according to an electric power supply to the coil, and the diaphragm blade is displaced by displacing the first magnet according to the change in the external magnetic field.